Fertilizer cultivation with inorganic fertilizer topdressing, if Quanchiposa, fertilizer effect is fast, but the role of time is short. Many tiny particles of chemical fertilizers that are not yet completely dissolved are easily eaten by the fish and affect the survival rate of the fry. Fertilizers can be packed into plastic woven bags to allow them to dissolve and diffuse naturally, which not only has stable fertilizer effect, low cost, light labor intensity, but also promotes the growth and reproduction of phytoplankton, and provides a large number of palatable natural foods for fish fry. The methods are now described as follows: 1. Hanging bags time. Choose sunny bagging fertilization, between 9 am and 3 pm, when the light is strong, the temperature is high, the photosynthesis of phytoplankton is strong, and the effect is good. 2. Fertilizer types and dosages. Nitrogen and phosphorus are indispensable nutrients for the growth and reproduction of phytoplankton. Commonly used nitrogen fertilizers are ammonium bicarbonate, urea, etc. Phosphate fertilizers include superphosphate, calcium magnesium phosphate, and so on. To a depth of 1 meter, ammonium bicarbonate 4 to 5 kilograms per acre, superphosphate 4 kilograms, or urea 2 to 3 kilograms, superphosphate 4 kilograms, such as calcium magnesium phosphate fertilizer for 4 to 5 kilograms. The specific dosage varies depending on conditions such as weather, water temperature, and water quality. 3. Instructions. Put the fertilizer into a bag and allow it to dissolve and diffuse naturally. About 4 plastic woven bags per acre can be attached? 1 snake skin bag can be cut 4 pieces. Nitrogen and phosphate fertilizers are put into bags, and they are hung into fish seedling pool 20 centimeters underwater, but nitrogen and phosphorus fertilizers cannot be mixed together. Inside the bag. Phosphate dissolves slowly, can hang more 1 to 2 bags, do not have phosphate fertilizer and nitrogen fertilizer at the same time hanging bags, it is best to hang phosphate fertilizers in the morning, nitrogen fertilizer in the afternoon. The number of hanging bags, generally 3 to 5 days hanging bags once? depending on the water thin fat set, when the fish pond into the new water, it is necessary to hang bags, and increase the number of bags.
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